Hydraulic telemeter system with variable-rate valve shutoff unit



Oct. 3, 1950 c. A. HUBERT HYDRAULIC 'rELmETER SYSTEM WITH VARIABLE-RATEvALvE sHU'roFF UNIT Filed Dec.. 4, 1948 l\ os mQN bm. NNN

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Patented Oct. 3, 1950 HYDRAULIC TELEMETER SYSTEM WITH VARIABLE-RATEVALVE SHUTOFF UNIT Clarence A. Hubert, Chicago, Ill., assignor toInternational Harvester Company, a corporation of New Jersey ApplicationDecember 4, 1948, Serial lNo. 63,482

This invention has to do with telemeter type hydraulic powertransmitting systems wherein operation of a fluid-driven motor isterminatable by the closing of a control valve therefor, and moreparticularly concerns an improved control unit quantitatively sensitiveto the ii'ow of fluid through the motor and being effective for closingthe valve and thus stopping the motor incident to a predeterminablequantity of such flow.

My improvement adapts hydraulic power transmitting systems of thetelemeter type to have any iluid capacity motor (within limits)connected therewith for operation in such a fashion that the drivenelement of the motor will occupy positions respectively corresponding topositions of a manually operated control member of such system, and alsoin such a fashion that each motor can be caused to operate throughoutits entire range of movement pursuant to movement of the control memberthroughout its entire range of 'movement Another object of thisinvention is the provision of a fluid driven unit connected in serieswith a fluid driven motor and a control valve for such motor, and havinga driven element connected with said valve for closing the same incidentto predetermined movement of the driven element, and the driven unitbeing regulatable to selectively vary the amount of driven elementmovement .per unit quantity of fluid Apassed through such driven unit.

A more specic object is the provision in a hydraulic telemeter system ofa fluid driven valveclosing unit wherein there is a gear type motor, arunning nut driven by such motor, a driven element connected with acontrol valve of the system, a lever connected between the running nutand the driven element, a fulcrum for said lever, and the fulcrum beingadjustable lengthwise of the lever to vary the number of gearpump 7Claims. (Cl. 121-41) revolutions necessary to move said driven eementfar enough to eiect closing of the control valve.

These and other desirable objects inherent in and encompassed by theinvention will be better understood upon reading the ensuing descriptionwith reference to the annexed drawing, wherein:

Fig. l is a partially diagrammatic view showing the elements of anhydraulic power transmitting system constituting a preferred embodimentof this invention.

Fig. 2 is a fragmentary view taken at the plane indicated by the line2-2 in Fig. 1 illustrating adjusting and indicating elements of thesystem.

Figs. 3 and 4 are diagrammatic views illus- 2 trating respectivehydraulic rams of different fluid capacity individually substitutablefor the hydraulic ram shown in the lower left-hand portion of Fig. 1.

With continued reference to the drawing, there can be seen in Fig. 1 asource II of fluid under pressure and having a high pressure outlet I2and a lowpressure inlet I3. There is also shown a control member I5operable through a linkage I6 for shifting a motor driven member I'I forswinging the same about a pivot I8 at 'its upper end and thus endwisemoving a plunger I9 of a control valve I4 for opening the same. Thecontrol member I5 could also be manipulated oppositely to the directionin which it'had been manipulated for opening the control valve and tothus close the control valve, although it is contemplated that in mostinstances the control member will be al'owed to occupy a position intowhich it has been moved for opening the valve and that there- 'after thevalve will be closed by the operation of a iluid driven unit 20 whichcomprises a gear motor 2| and a driven element 22 of such unit connectedby a -link 23 with the upper end of the motor driven member I'I.

The control valve I4 controlscommunicatio between the source II and afluid driven motor in the form of a two-way hydraulic ram B. Gear motor'2I is connected in series with the hydraulic ram B so that there iscorrelation between the amount said ram is caused to operate and thedistance the driven element 22 is moved for causing closing of thecontrol valve I4 and termination of operation of the ram.

While the control member I5 and the piston 24 (containing rephasingvalves V) of the ram B occupy correlated positions, as illustrated inFig. 1, the valve plunger I9 will be in the neutral position closing allports in the valve casing 25. Consequently fluid drawn from thereservoir R through a conduit 28 by a constant delivery pump 29 will bedischarged by that pump through a conduit 3| and thence through aconduit 32 into a chamber 33 of a pressure controlling valve34.

The pressure of this pumped fluid is imposed through a conduit 35, butsince enlarged portions'A 36 and 31 of the movable valve element I9 thenblock valve .ports 38 and 39, fluid cannot escape from the conduit 35and the-full pressure of the fluid is imposed upon a valve piston 4I forunseating a valve ball 42. Fluid from the discharge toward the limit Xof its range of movement toward' the limit Y of its` range of movementwill adjust the control valve I4 for causing movement of the motorpiston 24 toward the opposite end' of the motor cylinder. Concurrentlywith movement of the control member I5, the movable valve element I9 isadjusted from its neutral position for causing termination of the lowpressure by-pass condition of the fluid source II and creation of a highpressure condition. When, for instance, the control member I is moved tothe right toward position X, the enlargement 36 of the valve element I9will be moved out of registry with ports 38 and 46, whereby uid from theconduit 35 can escape through the ports 38 and 46 from the conduit 35back to the reservoir R. Because of a restriction 41 `in the conduit 32,the fluid can escape through the ports 38 and 46 sufliciently fast todiminish the pressure in the valve chamber 33 so that this pressure willbe insufficient to hold the by-pass valve lball 42 unseated. As aconsequence this ball 42 will seat and close the by-pass valve andterminate low pressure bypass.

During this high pressure condition of the source of pressure fluid,fluid at such high pressure will be delivered through the conduit I2 andcontrol valve ports 48 and 49 into a reversible flow conduit 5| whichleads through a check valve 52 to the left end of the motor cylinder 45.Fluid thus introduced to the left end of the motor cylinder 45 willforce the piston 24 to the right, displacing fluid from the piston rodend of said cylinder through the gear motor 2| and thence through acheck valve 53 of which the ball 54 is then held open by the pressure offluid above a piston 55. This uid acting upon the piston 55 reaches apiston receiving chamber 56 for such piston from the conduit 5I througha conduit 51. Because of the end area of the piston 55 exceeding thearea of the seat for the ball 54, a pressure in the chamber 56 above thepiston 55, not necessarily exceeding the pressure in a spring chamber 58containing the ball 54, will prevail over the pressure upon said balland'cause it to be unseated. Fluid discharged from the piston rod end ofthe motor B through the gear motor 2| and through the opened check valve53 enters a second reversible flow conduit 1|. Inasmuch as at this timethe control valve member I9 is moved to the left from the position shownin Fig. 1, and valve member enlargements 12 and 13 are to the left oftheir respectively associated ports 49 and 14, the fluid dischargedthrough the conduit 1I will flow through the port 14 and thence into theright end of a channel extending axially through the element I9. Fluidis discharged from the left end of this channel 15 through the port 46and theconduit I3 back to the reservoir.

Movement of the piston 24 toward the right end of the motor cylinder 45will continue until the fluid driven unit 20, energized by the gearmotor 2|, moves the control valve element I9 back to neutral. Upon suchmovement of the valve element I9 back to neutral, the ports 38 and 46will be closed again, preventing escape of fluid from the conduit sothat the fluid passing through the restriction 41 can again build up thepressure in the valve chamber 33 causing movement of the piston 4I forunseating the valve ball 42 and recreating the low pressure by-passcondition.

Disregard for the moment the structural details of the fluid driven unit20 for mechanically moving the upper end of the motor driven member I1for resetting the control valve element I9 to neutral after the plunger24 of the hydraulic ram B has been moved a distance correlated with thedistance the control member I5 has been manually set, and presume thatsaid control member has been moved from the position shown in Fig. 1toward position Y. Such movement of the control member toward theposition Y will be operable through the linkage I6 and the motor drivenwalking beam lever I1 for shifting the valve element I9 to the right andthereby uncover valve ports 49, 14, 39 and 11. Such uncovering of thexvalve ports 39 and 11 again permits fluid to escape from the conduit 35to cause diminution of pressure in the valve chamber 33 so the by-passvalve ball 42 will again seat and create a high pressure condition. Highpressure fluid will then ow through the conduit I2 and through ports 48and 14 into the reversible ilow conduit 1I, the direction of iluidthrough 'the conduit 1I having been in the opposite direction in theabove described operation `initiated by the control member I5 toward theposition X. The uid continues from the conduit 1I through the checkvalve 53 and the gear motor 2| into the right end of the ram cylinder45. This causes the gear motor 2| to operate in the opposite directionin which it operated when the fluid owed oppositely therethroughfollowing movement of the valve control element I9 to the left. Thefluid introduced into the right end of the ram or motor cylinder 45forces the piston or plunger 24 to the left thereby forcing fluidoutwardly through a conduit 18 past the check valve 52 and into theconduit 5I. At this time the check valve 52 is being forced open by thepressure of uid from the conduit 1| through a lateral conduit 19 into achamber 80 above a piston 8| of the unit 52 for forcing such pistondownwardly so that the stem projecting downwardly from the pistondisplaces the check valve ball from its seat. At this time the conduit5| will be communicative through the port 49 with the left end of thevalve element passage 15 so the fluid exhausted from the left end of thecylinder 45 passes through said passage 15 and thence through port 11 ofthe control valve into the conduit I3 for return tothe reservoir. Inthis phase of the operation, the fluid passing through the gear motorfor causing movement of the motor piston 24 to the left will energizethe fluid driven unit 20 for causing the motor driven walking beammember I1 to swing counter-clockwise about its then fixed pivot 16 forshifting the control valve element I9 toward neutral, that is, towardits valve ,closing position illustrated in Fig. 1. The distance thepiston 24 will have been moved responsive to -the movement of the leverI5 toward the position Y is correlated with the distance of suchmovement of the lever I5. Again when the valve element I9 is returned toneutral both ports 38 and 39vwill be closed to prevent escape of fluidfrom the conduit 35; therefore the fluid introduced through the passagerestriction 41 into the valve chamber 33 will be effective for openingthe pressure controlling valve 34 and recreating the low pressureby-pass condition.

This hydraulic power transmitting system has particular utility wheninstalled upon a tractor where the constant delivery pump 29 will becontinuously driven from the tractor engine. The hydraulic ram or motorB can be mounted directly upon the tractor and have a piston rod 90thereof connected through a link 9| and an arm 92 with a tractor mountedrock shaft 93. 'A power take-off arm 94 which is constrained forrotation with the rock shaft 93 contains holes 95 facilitating theconnection therewith of operating linkages to tillage tools, or thelike, which may be conventionally mounted upon the tractor. Movement ofthe ram piston 24 in one direction will, therefore, cause the arm 94 torock in one direction for increasing the operating depth of the toolswhereas movement of the piston in the opposite direction will decreasethe depth at which the tools operate or raise the ltools to a transportposition.

It is also contemplated that the ram B and the rock shaft 93, togetherwith the arms mounted thereon, will be mounted upon, an implement towedbehind the tractor. In this event, fluid conducting power take-01Tconduit means, embodied by the conduits 18 and 96, will terminate inconduit coupling devices 91 and 98 on the tractor and long flexibleconduits IIII and |92 communicative respectively with the conduits 18and 96 through the couplings 91 and 98, will lead to the ends of the ramcylinder 45.

Use of the fluid driven unit having a separate gear motor 2| forenergizing the same to shift the motor-driven walking beam member I'Ifor closing the control valve I4, facilitates placement of the ram B atany desired remote position. Since the gear motor 2| and the ram B areconnected in series, a driven element 22 of the fluid driven unit 20will be caused to be moved an amount correlated with the amount ofmovement of the ram piston 24 and, consequently, with the amount ofmovement of the rock shaft arm 94 and of any tools connected with suchrock shaft arm whereby the movement of such tools will be definitelycorrelated in direction and amount of movement with the direction andamount of initiating movement of the control member I5. I

Adjustment oi the fluid driven unit 20 is possible for adapting the useof different size or fluid capacity rams with the control apparatusincluding the control lever I5 upon the tractor. Said unit 2D includes athreaded shaft |06 constrained for rotatie-n with one of the gears, |91,of the gear motor 2|. An end of the shaft is rotatably supported in abearing |08. This shaft |06 carries a running nut |99 having trunnionbearings II| projecting diametrically oppositely therefrom for pivotcdconnection with the lower A bifurcated end of a lever I|2. The upper endof the lever I|2 is also bifurcated and each of the furcations at theupper end of such lever contains a vertical notch I I3 for respectivelyreceiving trunnion bearings |I4 projecting diametrically oppositely irom a driven element of the unit 2U in the form of the sleeve 22 whichis slidable endwise upon a rod I I5 held at its ends by socket membersIIS and |I1 suitably mounted upon the tractor.

A fulcrum in the form of a pin |I8 projects through a slot |I9 extendingendwise in they lever I I2. Said fulcrum is carried by a threade'dmember I2| mounted upon a threaded vertical shaft |22 which is rotatablysupported and held against endwise movement by bearings |23 and |24.Rotation of the shaft |22 and the consequent vered shaft tical positionof the fulcrum I I8 is obtained manually by a thumb screw |25 having aknurled head |26 at one end and a, beveled gear |21 at its opposite endmeshed with a companion beveled gear |28 fixed on the upper end of thethread- |22. A'travelng nut |29 upon the threaded portion of the thumbscrew |25 has a projection I3| disposed in a helical groove |32 of acylindrical element |33 mounted in bearings |34 and |35 for rotationabout its .principal axis. Movement of the running nut element |29axially of the members |25 and |33 pursuant to rotation of the thumbscrew head |26 will cause the element |33 to rotate an indicator element|39- therewith for indicating on a scale |31, Fig. 2, the verticalposition of the fulcrum ||8.

Operation of the fluid driven unit 20 in conjunction with the controlmember I5 and different size rams:

When a, medium size ram B is connected with the fluid-conducting powertake-off conducted means IB-96 through the detachable couplings 91-98,the unit 20 will be set to place the fulcrum ||8 at a position B"substantially midway between the two ends of the slot ||9 in the level nI2. Then assuming the `control lever I 5 is moved to position X at onelimit of its adjusting range, the lower end of this member will be movedto position D. The lower end of the walking bear". lever I1 will beswung to position D' incident to being pivotcd about the connection I8which, at that time, remains fixed. Such swinging of the lever I1 movesthe* control valve element I9 to the left, carrying connection N thereofwith the lever I 1 to position O. The control valve element4 I9. is,therefore,'moved a distance N-O `from -the neutral position N. Thus,opened control valve I4 causes fluid to pass downwardly under pressurethrough the conduit 5I, in the above described manner, into the left endof the ram B fcrA causing movement of the. piston '4 to the right. Suchmovement of the ram piston will continue-until the valve element I9 isreturncd to neutral, and moving of such element to the neutral positionis obtained by moving the upper Aend of the walking beam lever Il fromthe position shown in Fig. l, to position S which will carry the pivotbetween the lever Il and the right end of the valve element I9 fromposition O, back to position N. This is accomplished by the gear motor2| which is driven by the iiuifl exhausted from the right end of theram. B.

AFluid passing through the moto-r in this direction causes rotation ofthe threaded shaft |95 in the direction for moving the running nut |09to the left and when enough fluid has passed through the motor 2|for'moving the trunnions |I| to position BS, the lever II2 will havebeen pivoted clockwise about the fulcrum IIB stliiciently far to carrythe trunnions |I 4 of the driven element 22 to position S'. Pursuant tothis movement of the trunnions I I4 to the position Si. the links 23'connected between the element 22 and the upper end of the walking beamlever I1 will have been moved endwise far enough to place the pivot I8in position S. Thisris the amount of movement of the lever Ilto lreturnthe element I9 from position Oto N and thereby cylinder 45.

the cylinder 45, the lever will be thrown to the Y limit of itsadjustable range. When the lever I5 is thrown to position Y, the lowerend thereof will be moved to position E, swinging the lower end of thewalking beam lever I1 to position E', thereby moving the section of thelever I1 connected to the valve element |9 from the neutral positionN toposition P, causing opening of the valve I4 in such a, manner, describedabove, for iluid under pressure to flow downwardly through the conduit1| through the check valve 53, the motor 2|, and into the right end ofthe ram B. Fluid exhausted from the left end of the ram cylinder 45flows upwardly past the opened check valve 52 and through the reversibleflow conduit 5| to the` reservoir R in the above described manner. Thefluid owing in this direction through the gear motor 2| will reverse therotation of the shaft |06, causing the running nut |09 to move to theright. When the trunnions III on this nut reach the position BT thetrunnion I|4 on the now driven element 22 of the fluid driven unit 20will reach the position T', causing the links 23 to pull the upper endof the walking beam lever I1 to position T and return the right end ofthe control valve element |9 from position P to neutral position` N,closing the control valve and stopping operation of the ram Bcoincidently with the piston 24 reaching the left end of the cylinder45.

It is only when the control lever I5 is swung to its range terminalpositions X or Y that the lower end of the walking beam lever I1 will beswung about the pivot I8 to the terminal positions D' or E' andnecessitate subsequent swing ing of the upper end of the lever from itsmid-position all the way to the position S, or all the way to theposition T for re-establishing the neutral position N on theintermediate section of such lever II to reset the control valve elementI9 t0 neutral. Less distant manipulation of the lever I5 will causecorresponding less distant movements of the aifected parts forreestablishing the closed condition of the control valve I4. However, itis desired that full swinging of the lever between the terminalpositions X and Y will cause full range strokes of the ram piston 24between the right and left ends of its When this4 condition is attained,correspondingly shorter movements of the control lever |5 in eitherdirection from its mid-position will incur correspondingly shortermovements of the ram piston 24 in correlated directions from itsmid-position. To attain this condition there must be a definite relationbetween the distance the driven element 22 of the iluid driven unit isdriven per unit of distance that the ram piston 24 moves in response tothe application of fluid pressure thereto. This relation between theamount of movement of the piston 24 and the driven element 22 isestablished by coordinatingr the number of revolutions of the gear |01per unit volume of fluid passedthrough the motor, the pitch of thethreaded shaft |06 and the positionV of the fulcrum ||8 lengthwise ofthe lever ||2. Subsequent to selection of the gear motor having acertain gear speed per unit of uid passed therethrough and the selectionof .threaded shaft |06 of a certain thread pitch,

the variation of the distance which the driven element 22 of the fluiddriven unit 20 is driven per unit of linear travel of the ram piston 24is variable by changing the position of the fulcrum I I0 with respect tothe lever |I2. With the particular gear motor and thread pitch for theshaft |05 herein assumed, the volume of fluid caused to flow through thegear motor 2| as the piston 24 moves back and forth between the ends 'ofthe cylinder 45 causes the trunnions of the running nut |09 to move backand forth between the positions BS and BT. With the fulcrum IIB for thelever 2 at position B", such movement of the trunnions between positionsBS and BT will cause the trunnions ||4 on the driven element 22 to moveback and forth between the positions S' and T'. 'I'his range of movementof the driven member 22 between positions S and T' is that required forre-establishing the neutralv II 8 at the position B", the range ofmovement BS-BT of the running nut |09, which is established by thevolumetric capacity of the particular ram B is caused to be commensuratewith the maximum required range of movement If a smaller volumetriccapacity hydraulic ram A should have its associated conduits |0I' and|02' connected with the conduit terminals 9'I--9I in place of theconduits |0I and |02 of the hydraulic ram B, a lesser quantity of fluidwould be caused to ow through the gear motor 2| pursuant to movement ofthe piston 24 of the smaller ram between the ends of its cylinder.Therefore, movement of the piston 24' between the limits of its movablerange would be accompanied by endwise movement of the running nut |09between such limits as AS--AT. Under these circumstances, if the upperend of the lever 2 is to be caused to be moved through the entire rangeS'T' for maintaining coordination between the range of movement for thedriven member 22 and the complete adjustable range X-Y of the controlmember I5, the fulcrum member I I8 will need to be moved downwardly tothe position A". When the fulcrum member ||8 is in the position A"correlation will be preserved between the movement of the control lever|5 and the piston 24 of the smaller hydraulic ram A wherefore movementof the control member I5 to its terminal position X Will cause thepiston 24' to -move exactly to the right end of its cylinder whereasmovement of the control member I5 to its terminal position Y will causethe piston 24 to move exactly to the left end of its cylinder.Intermediate positions between the terminal positions X and Y into whichthe control member |5 is moved will cause the piston 24 to move tocorresponding intermediate positions. y

Should a hydraulic ram C have its conduits |0|" and |02 connected withthe terminals 91 and 98 in lieu of the conduits |0| and |02 o1 the ramB, a correspondingly greater amount ofV fluid would necessarily flowthrough the gear motor 2| for moving the piston 24" of this larger rambetween the ends of its associated cylinder. This volume of uid flowingthrough the gear motor would cause the runningV nut |09 to operatewithin the limits between the positions CS and CT, while causing thedriven element 22 of the fluid driven unit 20 to operate within therange S'T'. This is the proper distance this driven element should movefor having the proper restorative inuence upon the control valve elementI9 when such element I9 is manipulated by which is xed with respect tothe full .range movement X-Y of the control lever I5.

9 movement of the control member I5 within the range XY.

It may be said, therefore, since the fulcrum H8 of the fluid driven unit2|) is adjustable between the positions A", B" and C" for adapting theapparatus different identical control characteristics for the three tohave size rams A, B, and C, (or for other size rams accommodated byplacing the fulcrum member H8 at different respective positions in thelever slot H9) that said fluid driven unit is adjustable to selectivelydetermine the distance the driven element 22 thereof is driven pervolumetric unit of ow of the operating uid for a ram to therebyselectively calibrate the distance of movement of the control member I5with the amount of responsive operation of the ram. In other words, theposition of the fulcrum member H8 lengthwise in the slot H9 of the leverH2 can be utilized for causing full range control movement X-Y of thecontrol member I5 to incur full range movement of the pistons of dierentfluid capacity rams connected with the system as illustrated by thehydraulic ram B.

When the thumb screw |25 is rotated for causing the fulcrum member H8 tooccupy the position A", the running nut |29 on the threaded shank ofsaid thumb screw will be moved to position A and thereby cooperate withthe helical groove |22 in the cylindrical member |33 to place theindicator pointer I 36 at a position designated A in Fig. 2. This wouldindicate to the operator of a tractor when proper adjustment had beenmade for a hydraulic ram A to be connected with the piston. Rotation ofthe thumb screw |25 for placing the fulcrum ||8 at position B", therunning nut |29 will be stationed at position B and thereby cooperatewith the helical groove |32 for placing the indicator pointer |36 atposition B on the scale |31, Fig. 2, to indicate that the fluid drivenunit 20 is conditioned for the attachment of a ram of the capacity ofthe ram B to the system; and when the fulcrum H8 is in position C" therunning nut |29 and helical groove |32 will cause the pointer |36 to beat the position C in Fig. 2 for indicating proper adjustment for use ofa ram of the capacity of the ram C with the system.

Having thus described a single preferred form of the invention with theview of thoroughly and concisely illustrating the same, I claim:

1. A hydraulic power transmitting system comprising a control valveopenable to accommodate ow of fluid therethrough; valve control meansincluding a linkage, and a control member con-l 5..

nccted with the valve through such linkage and thus manipulatable toopen said valve; a hydraulic ram operable under the inuence of theflowing fluid responsively to the manipulation of said control memberand operable an amount constituting a function of the volume of suchflow; a uid driven unit connected in xseries with the control valve andincluding a driven element positively driven by the uid at a rateproportional to the rate of flow thereof through the valve, said drivenelement being connected with such linkage and operable therethrough tcclose the valve when driven a distance correlated with the distance thecontrol member was manipulated when openingr the valve, and said fluiddriven unit including means adjustable to selectively determine thedistance said driven element thereof is driven per volumetric unit offlow of the iiuid through the control valve to thereby selectivelycalibrate the distance of movementof the convl0 trol member with theamount of responsive operation of the ram.

2. A hydraulic power transmitting system comprising a control valveopenable to accommodate nected serially with the control valve and ramand including a driven element positively driven by the fluid flowingserially through said valve and ram at a rate proportional to the flowrate of such serially flowing iluid, said driven element being connectedwith said motor driven element and operable thereof to close the valvewhen such driven element has been driven a distance correlated with thedistance the control member was manipulated when opening the valve, andsaid fluid driven unit including means adjustable to selectivelydetermine the distancesaid driven element thereof is driven pervolumetric unit of ilow of the serially flowing iluidto therebyselectively calibrate the distance of movement of the -control memberwith the amount of responsive operation of the ram.'

3. A hydraulicpower transmitting system comprising a control valvemanipulatable from a neutral setting to accommodate ow of a iluid columntherethrough and resettable to neutral to preclude such ow; a hydraulicram operable subject to the ilow of such uid column; conduit meanscommunicatively connecting the valve and ram for directing the uidcolumn to flow serially therethrough; a fluid-driven unit interposed insaid conduit means and driven by and pursuant to the ilow of the fluidcolumn therethrough, said unit including a power output elementconnected with said control valve to reset the same to neutral whendriven pursuant to the driving of such unit; and said iluid-driven unitincluding means adjustable to selectively determine the amount saidoutput element is driven per volumetric unit of such fluid transferredbetween said ram and the conduit means.

4. A hydraulic power transmitting system comprising a control valveopenable to accommodate ow of fluid therethrough for operating rams ofdifferent 'bore and stroke selectively attachable thereto; valve controlmeans including a manually operated control member manipulatabledifferent distances attendant to opening such valve, and a motor-drivenmember drivable to close such valve; uid conducting power take-oilconduit means leading from the valve for selective communicativeconnection with said rams; a iluid driven unit interposed in saidconduit means and including a driven element which is driven by and at arate according to the amount of fluid passing through such unit, saiddriven element being connected with said motor-driven element of thevalve control means for driving the same, to close the valve when drivenan amount determined by the distance of manual setting of themanipulatable member attendant to opening the v'alve. and said fluiddriven unit including means adjustable to selectively determine theamount of movement of its driven element with respect to the volume ofuid passing through the unit forcorrelating the distance the selectivelyat- 11 tachable rams will be operated in accordance with the distancethe manipulatable member is set when opening the valve.

5. A hydraulic power transmitting system comprising a control valvemanipulatable from a neutral setting to accommodate ow of fluidtherethrough and resettable to neutral to preclude the ow of such iluid,a hydraulic ram,

-conduit means communicatively connecting said valve and ram fordirecting the fluid to flow therebetween to incur operation of the ramin accordance with the flow of such ud, a gear motor interposed in saidconduit means, a threaded shaft constrained for rotation with a gear ofsaid motor, a running nut meshed with the threads on said shaft forbeing moved endwise of said shaft pursuant to rotation thereof, a leverfulcrum, a lever mounted on said fulcrum and having a portion spacedfrom the fulcrum operably connected with the running nut to causeswingingof the lever about said fulcrum pursuant to movement of the nut,an element connected with another portion of the lever for movementthereby when the lever is swung, and means connecting said clement withthe valve for closing the same pursuant to predetermined movement of theelement by the swinging of the lever, and said fulcrum being adjustablelengthwise ofthe lever for determining the amount of movement of saidelement per unit volume of fluid passing through the gear motor andconsequently determining the amount the hydraulic ram is operated beforethe valve is closed, and means for adjusting said fulcrum.

6. A hydraulic power transmitting system comprising a control valveopenable to accommodate ow of iluid therethrough; valve control meansincluding a manually operated control member manipulatable vdiierentdistances attendant to opening such valve, and a motor-driven memberdrivable correspondingly diierent distances for closing the valve; ahydraulic ram; conduit means communicatively connecting said valve andram for directing the flow of such fluid therebetween to incur operationof the ram an amount according to the volume of flowed fluid; a gearmotor interposed in Vsaid conduit means; a threaded shaft constrainedfor rotation with a gear of such motor; a running nut meshed with thethreads on said shaft for being-moved endwise of the shaft pursuant torotation thereof; a lever fulcrum; a lever mounted on said fulcrum andhaving a portion spaced from the fulcrum operably connected with therunning nut to cause swinging of the lever about said fulcrum pursuantto movement of the nut; and means connecting another portion of thelever with said motor-driven member to cause valve-closing movementthereof when the lever is swung; and said fulcrum being adjustablelengthwise of the lever for de- `termining the amount of suchvalve-closing movement of the motor-driven member per unit volume offluid passing through the gear motor and consequently for determiningthe amount the hydraulic ram is operated per unit of manipulativeadjustment of the manually operated control member, and means foradjusting said fulcrum.

7. A hydraulic power transmitting system comprising a control valveopenable to accommodate ow of fluid therethrough for operating rams ofdilferent bore and stroke selectively attachable thereto; valve controlmeans including a manually operated control member manipulatabledifferent distances attendant to opening such valve, and a motor-drivenmember drivable to close such valve; fluid conducting power take-oilconduit means leading from the valve for selective communicativeconnection with said rams; a gear motor interposed in said conduitmeans; a threaded shaft constrained for rotation with a gear of saidmotor; a running nut meshed with the threads of said shaft for beingmoved endwise of said shaft pursuant to rotation thereof; a leverfulcrum; a lever mounted on said fulcrum and having a portionspacedfrorn the fulcrum operably connected with the running nut to causeswinging of the lever about the fulcrum pursuant to movement of the nut;means connecting an other portion of the lever with said motor-drivenmember of the valve control means for closing the valve pursuant to anamount of movement of said motor-driven member determined by thedistance the manually settable member is manipulated attendant toopening the valve; and said fulcrum being adjustable lengthwise of thelever for determining the amount of movement of said motor-,drivenmember per unit quantity of uid passing through the gear motor andconsequently through the conduit means, and means for adjusting saidfulcrum.

CLARENCE A. HUBERT.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS l

